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研究生: 邱俊賢
論文名稱: 關西-竹東地區鹼性玄武岩之實驗岩石學研究
指導教授: 劉德慶
Liu, Teh-Ching
學位類別: 碩士
Master
系所名稱: 地球科學系
Department of Earth Sciences
論文出版年: 2003
畢業學年度: 91
語文別: 中文
論文頁數: 86
中文關鍵詞: 玄武岩實驗岩石學關西
論文種類: 學術論文
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  • 關西-竹東地區位於臺灣北部,地質上處於西部麓山帶,屬於臺灣西部火成岩區。該區玄武岩以凸透鏡體夾於新第三紀沈積岩層,大多為帶狀,出露於中新世晚期的地層中,產狀以火山碎屑岩為主,熔岩流比較少,此外岩床、岩脈亦在此區出現。本實驗樣本採樣地點為關西鎮六畜窩錦山溪旁之露頭,樣本岩石經計算其應存礦物成分,依據玄武岩四面體分類屬於鹼性玄武岩類。
    本實驗利用高溫爐及高溫高壓儀進行一大氣壓與1.0京帕壓力下實驗岩石學研究,一大氣壓實驗步驟先將岩石磨成粉末,置於白金囊包中,設定溫度後,將樣本放入高溫爐內,經過數小時不等之反應時間,然後加以驟冷。1.0京帕實驗步驟則為將岩石粉末置於金鈀管囊中,再放入電爐組合,加壓至1.0京帕後,通電加熱,經數小時不等之反應,完成實驗。將實驗後之樣本灌膠,磨成光片,用反射式顯微鏡做初步鑑定,再用電子微探針分析結晶礦物與玻璃成分。
    實驗結果為此玄武岩在一大氣壓下之全融溫度約在1316℃,固相溫度低於1050℃,結晶順序為鈦鐵氧化物(1316℃)、橄欖石(1258℃)、斜輝石(1166℃)與斜長石(1092℃)。1.0京帕下之結晶順序為石榴子石(1350℃)、鈦鐵氧化物(1330℃)、橄欖石(1280℃)、斜輝石(1220℃)與斜長石(1110℃)。一大氣壓下玻璃成分中SiO2與CaO含量隨溫度降低而增加,MgO、FeO、Na2O與K2O含量隨溫度降低而減少。1.0京帕下玻璃成分中SiO2與K2O隨溫度降低而增加,MgO與CaO含量隨溫度降低而降低。由一大氣壓與1.0京帕之各溫度下玻璃成分的玄武岩四面體應存礦物成分圖,與前人所做的全岩分析成分比較,此區橄欖石矽質玄武岩與石英矽質玄武岩可在較低壓的環境(約1.0京帕至一大氣壓之間)經結晶分異而形成。

    摘要 Ⅰ 目錄 Ⅱ 圖目 Ⅳ 表目 Ⅴ 第一章 序論 1-1 地質概況 1 1-2 研究目的 6 1-3 採樣地點 6 1-4 前人研究 9 第二章 研究方法 2-1 岩相學研究 10 2-2 實驗樣本的製備 10 2-3 燒失量的測定 10 2-4 X光螢光分析 11 2-5 實驗岩石學研究 11 2-5-1 一大氣壓下之實驗 12 2-5-2 高溫高壓實驗 15 2-6 電子微探針分析 19 第三章 結果與討論 3-1 岩相學及全岩化學分析 22 3-1-1 岩相學分析 22 3-1-2 全岩化學分析 22 3-2 實驗岩石學之研究 22 3-2-1 結晶順序與熔融區間 22 3-2-1-1 一大氣壓下之實驗 28 3-2-1-2 1.0京帕下之實驗 28 3-2-1-3 溫度壓力圖 30 3-2-2 礦物化學 33 3-2-2-1 橄欖石 33 3-2-2-2 斜輝石 33 3-2-2-3 斜長石 40 3-2-2-4 氧化物 40 3-2-2-5 石榴子石 50 3-2-3 關西-竹東地區玄武岩之岩漿演化 53 3-2-3-1 液相成分隨溫度變化趨勢圖 53 3-2-3-2 液相成分隨二氧化矽變化圖 62 3-2-3-3 液相成分之全鹼量隨二氧化矽變化圖(哈克式圖) 62 3-2-3-4 鹼金屬-全量鐵-氧化鎂圖(AFM圖) 67 3-2-3-5 斜長石-橄欖石-石英成分圖 67 3-2-3-6 透輝石-橄欖石-霞石成分圖 67 3-2-3-7 應存礦物 73 第四章 結論 76 致謝 78 參考文獻 79

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